Joel Greenblatt's position in Interdigital is currently worth $1.23 Million. That's 0.01% of their equity portfolio (790th largest holding). The first Interdigital trade was made in Q4 2010. Since then Joel Greenblatt bought shares 26 more times and sold shares on 27 occasions. The stake costed the investor $520 Thousand, netting the investor a gain of 136% so far.